Up until now I've used the free 7-Zip application to compress files uploaded to the website. Recently myself and others have had some difficulty in unzipping these files when they're downloaded. The Windows 7 version of 7-Zip appears to have some problems and so I no longer use it. In fact Windows 7 has what appears to be a perfectly good zipping application built in so I now use that. If anyone has problems with any downloaded files, please let me know and I'll try and sort it out for you. I haven't been through every downloadable item on the site so chances are there are a few others. Just email me and I'll send you the files direct whilst I try and correct the error on the site. In some cases, I no longer have the original files and if I can't unzip them myself then I'll re-write as near an equivalent as I can get to.